Anti-corrosive coating on magnesium and its alloys

Details Anti-corrosive coating on magnesium and its alloys Anti-corrosive coating on magnesium and its alloys

1979-01-17

1980-01-22

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 56R, C25D 1130

Patent

active

041849264

ABSTRACT:
To produce a corrosion-resistant coating thereon which is hard and uniform and capable of withstanding the action of strong acids and alkalis, a body of magnesium metal or an alloy of magnesium is first treated with an aqueous solution of hydrofluoric acid to form a fluoromagnesium layer on the metal surface. The coated metal is then immersed in an electrolyte bath comprising an aqueous solution of alkali metal silicate, and an aqueous solution of an alkali metal hydroxide. An electrical potential is applied between the magnesium metal anode and a cathode (iron or nickel) in the bath until a visible spark is discharged on the surface of the metal. The potential difference is maintained for a few minutes until a uniform silicate layer is formed on the fluoromagnesium layer.

REFERENCES:
patent: 1574289 (1926-02-01), Keeler
patent: 2313754 (1943-03-01), Loose
patent: 3832293 (1974-08-01), Hradcovsky et al.
patent: 3834999 (1974-09-01), Hradcovsky et al.

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